One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,10)(4,15)(5,8)(6,9)(7,12)(11,13)(14,16)(18,23)(19,26)(20,29)(21,24)(27,28)(31,32) involution — undirected(1,2,5,15,6,9,4,8)(3,7,13,16,14,11,12,10)(17,18,24,29,22,20,21,23)(19,25,26,32,28,30,27,31)(1,2)(3,11)(4,8)(5,15)(6,9)(7,14)(10,13)(12,16)(17,19,22,28)(18,25,20,30)(21,27,24,26)(23,31,29,32)(1,3,4,12,6,14,5,13)(2,7,8,10,9,11,15,16)(17,20,24,23,22,18,21,29)(19,25,26,32,28,30,27,31)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.